Merchandise display rack



g- ,1965 H. L. KOLSTER ETAL 3,200,961

MERCHANDISE DISPLAY RACK Filed April as, 1965 3 Sheets-Sheet 1 INVENTORS' HARvEv L. KOLSTER. FREDERICK A. BURKE g BY Douams A. LONG ATTORNEYS 1965 H. 1.. KOLSTER ETAL 3,200,961

MERCHANDISE DISPLAY RACK Filed April 23, 1963 3 Sheets-Sheet 2 INVENTOR HA2 VEV LKOL STER FREDERICK A. BURKE s DOUGLAS A. Low

ATTORNEYS 7 Aug. 17, 1965 H. L. KOLSTER ETAL 3,200,951

MERCHANDISE DISPLAY RACK Filed April 25, 1965 3 Sheets-Sheet 5 INVENTORS H/mvEy L. KOLSTER FEEDER/CH A. BURKE BYDOUGLAS A. LONG United States Patent 3,2tlll,96l ll iERfZHANDlSE DISPLAY RACK Harvey L. Koister, independence, Min, and Frederick A.

Burke, Mamaroneclr, and Douglas A. Long, New Yorlr,

N.Y., assignors to Hallmark Cards, Incorporated, Kansas City, Man, a corporation of Missouri Filed Apr. 23, 1963, Ser. No. 275,017 8 Claims. (Cl. 211-448) This invention relates to merchandise display fixtures and more particularly to new and improved sectional or modular display shelf assemblies.

The principal objects of the present invention are: to provide an assembly for displaying merchandise which includes a basic frame structure with various interfitting parts adapted to produce a great variety of finished forms for solving specific display problems; to provide such a display fixture having self locking components which permit assembly, alteration and disassembly without the need for bolts, screws or similar fasteners; to provide such a merchandise display fixture which is adapted to permit attractive display of a great variety of merchandise; to provide such a display fixture which selectively include drawer assemblies for storage of merchandise not displayed; to provide such a display fixture having spaced apart basic frames which are maintained in fixed modular relation to each other by simple transverse support members easily engaged therewith; to provide such a shelf assembly having standard frames which, in addition to providing modular construction, may be placed at right angles to other frames to produce corner displays at the end of the fixture; and to provide such a display fixture which is simple and inexpensive in construction and sturdy, attractive and versatile in use.

Other objects and advantages of this invention will become apparent from the following description taken in connection with accompanying drawings wherein are set forth by way of illustration and example certain embodiments of this invention.

FIG. 1 is a perspective view of a merchandise display assembly embodying this invention with portions broken away to reveal details of construction.

FIG. 2 is a perspective view showing a pair of frames and connecting supports forming a basicmodular section of the display assembly.

FIG. 3 is a fragmentary perspective exploded view on an enlarged scale showing details of the joint between a frame and a lateral support.

FIG. 4 is a fragmentary perspective exploded view on an enlarged scale showing the receipt of an extension into a front support column of a frame.

FIG. 5 is a fragmentary perspective exploded view on an enlarged scale with portions broken away showing an end panel in position for assembling with the support columns of a frame.

. FIG. 6 is a fragmentary perspective exploded view on an enlarged scale showing the joint between a back panel and the rear support column of a frame.

FIG. 7 is a fragmentary perspective exploded view on an enlarged scale showing an angularly adjustable shelf receiving channel member assembled with the support columns of a frame.

FIG. 8 is a fragmentary perspective exploded View on an enlarged scale showing a light supporting unit receivable in a rear support column of a frame for supporting elongated light units over the display assembly.

FIG. 9 is a fragmentary perspective exploded view showing a double drawer unit in position for assembly with a frame and connecting laterally extending frame supports.

FIG. 10is a fragmentary exploded perspective view showing the stacking of and connection between single ice FIG. 12 is a fragmentary perspective exploded view showing a frame arrangement for receiving an outside corner base.

FIG. 13 is a fragmentary perspective exploded view on an enlarged scale showing the mounting of card displays units on the frame.

Referring to the drawings in more detail:

The reference numeral 1 generally indicates a sectional knock-down merchandise display shelf assembly embodying this invention. The assembly .1 comprises a plurality of metal frames 2, in the illustrated example of rectangular tubing and each having a rectangular center portion 3 comprised of spaced apart upper and lower horizontal bars 4 and 5 and forward and rear vertical bars 6 and 7. Spaced apart front and rear vertical legs 8 and 9 extend downwardly from the lower horizontal bar 5 at positions spaced inwardly from the vertical bars 6 and 7 and terminate at the lower ends thereof in threaded sleeves 10 (FIG. 3) receiving vertically adjustable foot members 11 for supporting the respective frame 2.

A rear support column 12 extends upwardly from the upper horizontal bar 4 adjacent the rear vertical bar .7. and has vertically spaced apart perforations 13 extending laterally transversely therethrough, the perforations 13 being horizontally coaxially aligned across the hollow interior 14 of the support column 12. The rear support column 12 also has a pair of vertically extending and.

vertically spaced apart slots 15 extending rearwardly thereinto. The rear support column 12 terminates at the upper end thereof in a pin receiving socket opening bar 19 extends between the front and rear support columns 17 and 12 at the level of the socket opening 18.

Vertical slots 2t) extends laterally transversely into the front and rear vertical legs 3 and adjacent the lower horizontal bar 5. The shelf includes front and rear elongated parallel horizontal laterally extending angle supports 21 and 22 respectively. The rear angle support 22 includes a horizontal flange portion 2? and a vertical flange portion 29'. The front angle support 21 has a vertical flange portion 3%). The front and rear an'gle supports 21 and 22 terminate at opposite ends thereof in an integral vertical leg portion 2 3 having a transverse horizontal width slightly smaller than the width of the leg slots 21} and a height substantially equal to the height of the leg slots 26 The leg portions 23 include an upwardly extending notch 24 having a front edge 25 sloping inwardly as it extends upwardly and a substantially vertical rear edge 26 terminating at the upper end thereof a horizontal distance from the upper end of the front edge 25 substantially equal to the wall thickness of the hollow legs 8 and 9. The angle supports 21 and 22 have outer edges 27 extending upwardly from the verticalleg portions 23 and aligned with the leg portion notch rear tions 23.

. 26 and outer edge Z'Tagainst the surface of the respective 3 vertical legs 8 and 9 forming a therebetween.

The rear angle support 22 with its upper horizontal flange portion 29 presents a smooth generally large area of vertical support surface and the front angle support 21 with its vertical flange portion 3'9 has spaced apart risers 31 formed thereon. A drawer unit 32 is of a width adapted to be received between respective frames 2 and rests on the front and rear supports 21 and 22. The drawer unit 32 has a downwardly open transverse groove 33 therein which is adapted to receive the upper edge of the vertical flange portion Stland particularly the risers firm right-angle joint 28 31 for preventing forward and rearward shifting of the drawer unit 32. In the illustrated example, the drawer unit 32 has a unitary box frame 34, which holds upper and lower drawers 35' and 36. If desired however, the double drawer may be formed of a lower drawer unit 37 resting on the supports 21 and 22 as above described and an upper drawer unit resting on the unit 37, FIG. 10.

' When using upper and lower drawer units, the respective units are provided with upwardly and downwardly open alignment bores 39 and dil and an alignment pin i-l'having a head ill of greater diameter than the bores. The pin all is extended through the bores for preventing relative shifting ofthe drawer units with respect to each other, the head being engageable with the upper unit 38 for support.

A top cover 42 for a drawer unit comprises a fiat board member d3 covering substantially the entire top of the respective unit and having opposite parallel side edges 44 extending'beyond the side edges of the respecf tive drawer unit. The side edges 44 have spaced apart notches 45 extending thereinto for respectively simulta neously receiving the front and rear support columns 17 and 12 of opposing frames frames 2 of a module. Note that the top cover 42 is pivoted about one side edge there of asit engages the opposite support columns as indicated by the arrow '46 and when resting in place cannot be shifted forwardly or laterally due to the engagement with the respective support columns.

A drawer locating clip d7 is mounted on the opposite sides of the respective drawer units and is adapted to engage around the front support columns 17 when the drawer unit is in place on the supports 21 and 22. The

locating clip 47 includes suitable notches 48 providing relief for the insertion of a screwdriver to mount the clip on the drawer wall.

Perforations 49 extend through the front support column 17 in the same manner as the perforations 1 .3 on the rear support column 12. V

A vertical back panel member 51 has parallel side edges 52 spaced apart substantially the distance between opposed rear support columns 12. Spaced apart clips 53 are secured to the back panel member 51 adjacent the respective side edges 52 in positions spaced selected non-symmetrical distances from the upper or end edge 54 thereof. The clips 53 extend first forwardly at 55 then laterally outwardly at as and then rearwardly at '57'terminating in vertical inserts 53 respectively simultaneously receivable in the rear support column slots 15. The inserts 58 have an inwardly tapered notch 59 extending upwardly thereinto for engaging the wall of the rear support column 12 upon downward displacement of the back panel member after the inserts 58 have been inserted into the respective slots 15. The clips 53 support the back panel member 51 rearwardly of the rear support column perforations 13 whereby the back panel member 51 is held across the rear of the frames 2 but does not cover the inside perforations 13 of the rear sup-. port column 12.

in various positions with respect to the frames and a selected variation in height of the end edge 54 which is uppermost may be obtained merely by a simple rotation and re-engagement.

Right and left hand end panels 61 and 62 are mirror images of'each other and are adapted for assembly with respective opposing frames 2. The end panels 61 and 62 each comprises a relatively thick preferably wooden inner layer 63 having elongated spaced apart vertical grooves 64 and s5 and an intersecting horizontal generally central groove as coinciding with respective portions of front and rear support columns 17 and 12 and the horizontal brace bar 19. Three relatively thin hard board sections 67, 68 and 69 are secured to the grooved face 7d of the inner layer 63 and have respective straight edges 71 aligned with but not obstructing the inner layer grooves 64, 65 and 66. The sections d7, 6t and 69 increase the depth of the grooves to approximately one-half the lateral thickness of the respective frames 2 whereby the end panels 61 and 62 may be installed against respective opposing inside surfaces of the frames 2 (of a module) and snugly fit thereagainst without shiftingso long as the respective'end panels are prevented from moving inwardly toward each other. As best illustrated in FIG. 5, the end panels 61 and 62 take the form of asqu are corner member with an opposite downwardly and forwardly sloping edge at 712 to form attractive side members which substantially cover the'exposed portions of the frames 2 when they are associated with display units noted hereinafter.

The'panel vertical groove 64,'which is at a level to receive the front support column 17 therein, extends 1en-.

tirely through the inner layer 63 above thefront support column socket openings 18. Thus, an extension member-exposing inner slot '73 is formed permitting access from between the respective end panels 61 and 62 to positions directly above the socket opening 13. An elongated extension member 74 of similar cross-sectional dimension as the support columns i7 and 112 and having sim ilar spaced perforations therethrough includes a fixed depending pin 75 receivable in the socket opening 13 for increasing the vertical height of the front support column 17; The depending pin '75 has transverse spaced perforations 76 therethrough coinciding with perforations 43 on the front support column when the extension member 7 is engaged in the socket opening 18 whereby transverse access is permitted through the perforations 49 whether or not the extension member 74 is assembled therewith; The inner slot 73 permits a pin orthe like to extend from the extension member '74 to a position between the respective frames 2 for supporting structure noted hereinafter without interfering with the end panels 61 and 62. A pair of oppositely disposed spaced apart channels 77 and 78 are of the type described in greater detail in patent application Serial No. 166,245, filed January 15, 1962 now US. Patent 3,120,199, granted February 4, 1964. Each channel has spaced legs 79' and 80 and a Web 81 and opens inwardly of a pair of opposed frames 2. The channels includea rear'portion 82 and a forward portion 83 and a rear web pin 'is'secured to the rear portions (32 and extends outwardly ofthe web for insertion into a selected rear support column perforationlS. A longitudinally extending slot 85 is in the web 'of each forward portion 83 and a forward web pin 86 is supported for longitudinal sliding along the web slot and extends outwardly of the web for insertion into a selected'perforation in a front support column T7 or extension member 74. A shelf 37 has opposite end portions respectively adapted to be received in thechannels 7'7 and 78 for locking'th'e web pins in the respective perforations for maintaining various angular and elevational adjustments of the shelf. A bore 59 extends vertically through the upper channel leg '79 and a screw )9 is receivable through the .bore 39 and into the shelf for preventing unwanted sliding of the shelf from a channel, for example when the shelf is sloped downwardly as at 91, FIG. 1. When the shelf is sloped downwardly it is desirable to secure a suitable lip 92 on the outer edge thereof to prevent merchandise from sliding ofi.

Vertical support members 93 terminate at the lower end thereof in depending supporting pins 94 receivable in the rear support column socket openings 16 forming a firm joint. Forwardly extending struts 5 are secured to the upper ends of the vertical support members 93 and at the outer ends thereof support elongated lighting units 96 therebetween in positions over the center portion of the frames 2. The lighting units 96 include suitable end closure caps 97 secured to elongated translucent panels 93 surrounding elongated fluorescent light bulbs or cylinders 9%.

A card display unit ltlt) has multiple horizontally extending card display rows liil together forming a concave are for ease of viewing. The card display unit 1% has supporting sideboards 102 with upwardly extending pin notches itifa located intermediate the ends thereof for receiving supporting pins 194 engaging in aligned perforations in opposing front columns 17. Depending upon the height of the notch 1% the pin 194 may extend through the inner slot 73 so as to support the card display unit ltd} without intefering with an end panel 61 or 62 (FIG. 1). The card display unit ltiti rests at the respective upper and lower ends thereof on the back panel member 51 and on the drawer top cover 42, the pins 104 maintaining the proper unit position. Normally two or more card display units we are placed in lateral abutting relationship as illustrated in FIG. 13 and a vertical divider W3 having upwardly extending slots 1%" covers the joint therebetween. Clips 1M maintain the respective rows 191 in continuous alignment.

In the illustrated example, one of the frames 2 at Hi5 extends at 90 to an adjacent frame from the respective rear supporting columns 12 thereof, FTG. 12. An outside corner base member me has side walls 167 extending at 90 to each other. The sidewalls Hi7 respectively have horizontally spaced clips 1% secured thereto for engaging the respective upper horizontal bars 4 for maintaining the latter frames fixed at 90 with respect to each other and to the corner base member 196. The corner base member me has an upper horizontal surface 169 extendir: atthe same level as the top drawer cover all when resting on a double drawer unit. Referring to FIG. 1 a curved card display unit 1149 has intermediate pin receiving notches 111 receiving pins extending through respective end panels 112 and 113 similar to the panel engaged with the last named frames in the same manner as described above in connection with the card display unit 1%. The curved display unit 119 rests at the lower and upper ends thereof respectively on the upper surface 199 and against the end panels 112 and 113 which, in this instance extend at 90 to each other.

Various types of merchandise display trays such as elongated sectional tray 1114 have suitable clips 115 secured thereto and engaging the horizontal bars 4 in the manner described above with respect to the corner base 1&6 but suspended between parallel frames 2. Other types of merchandise display trays such as trays 116 may be suitably secured or rested on shelves 117 supported by opposing channels in the manner described above with respect to the shelf 87.

It is to be understood that the modular construction above described permits an endless variety in the display assembly to meet particular requirements while using the basic frame structure and supporting members. It is to be further understood that while one form of this invention has been illustrated and described it is not to be limited to the specific form or arrangement of parts herein described and shown except insofar as such limitations are included in the claims.

What we claim and desire to secure by Letters Patent is:

1. A sectional knock'down merchandise display assembly for supporting display members comprising the combination of: a plurality of laterally spaced planar metal frames of tubing and each having a center portion, including joined bars, spaced apart forward and rear vertical legs extending downwardly from one of said bars and terminating at the lower ends thereof in foot members for supporting said respective frames, a rear support column extending upwardly from one of said bars and having vertically spaced apart perforations extending transversely therethrough, a front support column extending upwardly from one of said bars and spaced forwardly of said rear support column and having vertically spaced apart perforations extending transversely therethrough, front and rear elongated horizontally extending supports between respective frames, said supports terminating at opposite ends thereof in joining portions, said joining portions engaging said respective legs forming firm joints therebetween for spacing said frames, and pins receivable in said front and rear support column perforations for supporting display members between respective frames, said front and rear supports having flanges, a drawer unit having a downwardly open transverse groove therein, said drawer unit being received between respective frames and resting on said front and rear supports with one of said flanges being received in said transverse groove for preventing forward and rearward shifting of said drawer unit.

2. The assembly as set forth in claim 1 wherein said drawer unit is a lower drawer unit and has an upwardly open alignment bore, an upper drawer unit received between respective frames and resting on said lower drawer unit, said upper drawer unit having a downwardly and upwardly open alignment bore alignable with said upwardly open bore and an alignment pin having a head of greater diameter than said bores and extending downwardly through said last named bores with said head engageable downwardly on said upper drawer unit, said pin preventing relative shifting of said upper and lower drawer units.

3. A sectional knock-down merchandise display assembly for supporting display members comprising the combination of: a plurality of laterally spaced planar metal frames of tubing and each having a center portion including joined bars, spaced apart forward and'rear vertical legs extending downwardly from one of said bars and terminating at the lower ends thereof in foot members for supporting said respective frames, a rear support column extending upwardly from one of said bars and having vertically spaced apart perforations extending transversely therethrough, a front support column extending upwardly from one of said bars and spaced forwardly of said rear supp0rt column and having vertically spaced apart perforations extending transversely therethrough, front and rear elongated horizontally extending supports between respective frames, said supports terminating at opposite ends thereof in joining portions, said joining portions engaging said respective legs forming firm joints therebetween for spacing said frames, and pins receivable in said front and rear support column perforations for supporting display members between respective frames, said rear support columns having vertically extending slots extending rearwardly thereinto and including; a vertical back panel member having side edges spaced apart substaiit i ally the distance between opposed rear support columns, and spaced apart clips secured to said back panel member adjacent said back panel side edges and extending first forwardly and then laterally outwardly and then rearward ly terminating in vertical inserts simultaneously receivable in said rear support column slots, said inserts: having an inwardly tapered notch extending upwardly thereinto for engaging a wall of said rear support columns upon downward displacement of said back panel member, said clips supporting said back panel member rearwardly of said rear support column perforations, whereby said pins do not interfere with said back panel member, said inserts each having 'a second notch extending downwardly thereinto for permitting rotation of said back panel with subsequent rear support column wall engagement upon insertion of said inserts into said rear support column slots.

4. A sectional knock-down merchandise display shelf assembly for supporting display members comprising the combination of: a plurality of planar frames each having a rectangular center portion comprised of spaced apart upper and lower horizontal bars and forward and rear vertical bars, spaced apart forward and rear vertical legs extending downwardly from said lower horizontal bar at positions spaced inwardly from said vertical bars and terminating at the lower ends thereof in foot members for supporting said respective frames, one of said frames extending at 90 to an adjacent frame, a base member having side walls extending at 90 to each other and respectively having spaced clips secured to said walls for engaging said respective upper horizontal bars for maintaining said last named frames fixed with respect to each other and to said base member.

5. Asectional knock-down merchandise display assembly for supporting display members comprising the com bination of: a plurality of laterally spaced planar metal frames of tubing and each having a center portion including joined bars, spaced apart forward and rear vertical legs extending downwardly from one of said bars and terminating at the lower ends therof in foot members for supporting said respective frames, a rear support column extending upwardly from one of said bars and having vertically spaced apart perforations extending transversely therethrough, a front support column extending upwardly from one of said bars and spaced forwardly of said rear support column and having vertically spaced apart perforations extending transversely therethrough, front and rear elongated horizontally extending supports between said respective frames, said supports terminating at opposite ends thereof in joining portions, said joining portions engaging said respective legs forming firm joints therebetween for spacing said frames, pins receivable in said front and rear support column perforations for sup porting display members between respective frames, said front andrear supports having legs, and a drawer unit having a downwardly open transverse groove therein, said drawer unit being received between respective frames and resting on said front and rear support with one of said support legs being received in said transverse groove for preventing forward and rearward shifting of said drawer unit, said drawer unit including drawer locating clips fixed to the sides of said drawer unit and engaging a pair of said front support columns.

6. A sectional knock-down merchandise display assembly for supporting display members comprising the com bination of: a plurality of laterally spaced planar metal frames of tubing and each having a center portion including joined bars, spaced apart forward and rear vertical legs extending downwardly from one of said bars and terminating at the lower ends thereof in foot members for supporting said respective frames, a rear support column extending upwardly from one of said bars and having vertically spaced apart perforations extending transversely therethrough, a front support column extending upwardly from one of said bars and spaced forwardly of said rear support column and having vertically spaced apart perforations extending transversely therethrough, front and rear elongated horizontally extending supports between respective frames, said supports terminating at opposite ends thereof in joining portions, said joining portions engaging said respective legs forming firm joints therebetween for spacing said frames, pins receivable in said front and rear support column perforations for supporting display members between respective frames, a horizontal brace bar extending between said front and rear support 0 columns above said joined bars and including right and left hand end panels for assembly with said frames, said end panels each comprising a relatively thick inner layer having elongated spaced apart vertical grooves and an intersecting horizontal generally central groove in one face thereof, said grooves respectively being of substantially the same width and coinciding with portions of a front and rear support column and horizontal brace bar of a frame, a plurality of relatively thin outer layer sections secured to said one face and having edges aligned with but not obstructing said inner layer grooves, said outer layer sections increasing the depth of said last named grooves to approximately one half the thickness of said frames whereby said end panels may be installed against the respective opposing inside surfaces of respective frames and will not shift in the plane of said respective frames.

7. A sectional knock-down merchandise display assembly for supporting display members comprising the combination of: a plurality of laterally spaced planar metal frames of tubing and each having a center portion including joined bars, spaced apart forward and rear vertical legs extending downwardly from one of said bars and terminating at the lower ends thereof in foot members for supporting said respective frames, a rear support column extending upwardly from one of said bars and having vertically spaced apart perforations extending transversely therethrough, a front support column extending upwardly from one of said bars and spaced forwardly of said rear support column and having vertically spaced apart perforations extending transversely therethrough, front and rear elongated horizontally extending supports between respective frames, said supports terminating at opposite ends thereof in joining portions, said joining portions engaging said respective legs forming firm joints therebetween for spacing said frames, pins receivable in said front and rear supports column perforations for supporting display members between respective frames, said rear support columns terminating at the upper end thereof in extension receiving socket openings, vertical support members terminating at the lower ends thereof in depending supporting pins receivable in said respective support column socket openings, and forwardly extending struts secured to the upper ends of said vertical support columns, said latter struts supporting elongated transversely extending lighting units therebetween over said frames.

8. A sectional knock-down merchandise display assembly for supporting display members comprising the combination of: a plurality of laterally spaced planar metal frames of tubing and each having a center portion including joined bars, spaced apart forward and rear vertical legs extending downwardly from one of said bars and terminating at the lower ends thereof in foot members for supporting said respective frames, a rear support column extending upwardly from one of said bars and having vertically spaced apart perforations extending transversely therethrough, a front support column extending upwardly from one of said bars and spaced forwardly of said rear support column and having vertically spaced apart perforations extending transversely therethrough, front and rear elongated horizontally extending supports between respective frames, said supports terminating at opposite ends thereof in joining portions, said joining portions engaging said respective legs forming firm joints therebetween for spacing said frames, pins receivable in said front and rear support column perforations for supporting display members between respective frames, and a multiple horizontal card display unit for insertion between respective frames and having side boards with upwardly extend ing pin notches intermediate the ends thereof for receiving (References on following page) 9 16 References Cited by the Examiner 2,963,173 12/60 Barnes 211-177 UNITED STATES PATENTS 3,045,834 7 62 Z 211177 1,473,817 11/23 Gursline 211--1s2 X FOREIGN PATENTS 2,108,516 2/38 Thompson 211-148 X 5 875,060 4/53 Germany. 2,557,262 6/51 Cordes 211-176 1,026,237 3/58 Germany 2,582,553 1/52 McMurtrie 211--148 X 696,579 9/ Gr at Brltaln. 2,937,767 5/60 Butler 211148 2 954 12 9 /6O idd 211 .17 CLAUDE LE Exflmmer.

2,962,334 11/60 Dutmers 312-108 10 FRANK L. ABBOTT, Examiner. 

7. A SECTIONAL KNOCK-DOWN MERCHANDISE DISPLAY ASSEMBLY FOR SUPPORTING DISPLAY MEMBERS COMPRISING THE COMBINATION OF: A PLURALITY OF LATERALLY SPACED PLANAR METAL FRAMES OF TUBING AND EACH HAVING A CENTER PORTION INCLUDING JOINED BARS, SPACED APART FORWARD AND REAR VERTICAL LEGS EXTENDING DOWNWARDLY FROM ONE OF SAID BARS AND TERMINATING AT THE LOWER ENDS THEREOF IN FOOT MEMBERS FOR SUPPORTING SAID RESPECTIVE FRAMES, A REAR SUPPORT COLUMN EXTENDING UPWARDLY FROM ONE OF SAID BARS AND HAVING VERTICALLY SPACED APART PERFORATIONS EXTENDING TRANSVERSELY THERETHROUGH, A FRONT SUPPORT COLUMN EXTENDING UPWARDLY FROM ONE OF SAID BARS AND SPACED FORWARDLY OF SAID REAR SUPPORT COLUMN AND HAVING VERTICALLY SPACED APART PERFORATIONS EXTENDING TRANSVERSELY THERETHROUGH, FRONT AND REAR ELONGATED HORIZONTALLY EXTENDING SUPPORTS BETWEEN RESPECTIVE FRAMES, SAID SUPPORTS TERMINATING AT OPPOSITE ENDS THEREOF IN JOINING PORTIONS, SAID JOINING PORTIONS ENGAGING SAID RESPECTIVE LEGS FORMING FIRM JOINTS THEREBE- 